apply trick

newhat.kt

override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
    return ProgressDialog(context).apply {
        setMessage(arguments.getString(ARG_MESSAGE))
        setProgressStyle(ProgressDialog.STYLE_SPINNER)
    }
}

oldhat.kt

override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
    val dialog = ProgressDialog(context)
    val message = arguments.getString(ARG_MESSAGE)
    dialog.setMessage(message)
    dialog.setProgressStyle(ProgressDialog.STYLE_SPINNER)
    return dialog
}